Merge pull request #9 from plesk/fix-unbalanced-parenthesis

Remove extra '\' in the regular expression for repository adoption

ubuntu18to20/upgrader.py

@@ -94,7 +94,7 @@ def construct_actions(
                     '\g<1>://\g<2>/\g<3>20.04\g<4>',
                 ),
                 actions.ReplaceAptReposRegexp(
-                    r'(http|https)://([^/]+)/(.*\b)18\(\b.*)',
+                    r'(http|https)://([^/]+)/(.*\b)18(\b.*)',
                     '\g<1>://\g<2>/\g<3>20\g<4>',
                 ),
             ],